Uh-hunh. I wouldn't completely trust that if I were you. Let's take it step-by-step.
Use "type" or "which" or "whence" to find the full path of the linpack executable:
verify this has been compiled dynamically and not statically:
You should see something like "Dynamically linked i386 object". As long as you don't see "statically linked binary" proceed to the next step. Otherwise, talk to your system admin and ask him/her very specifically how he/she compiled it.
Next, run
You should see something like "libopen-rte.so" in the output. If you do not, ask your sysadmin to point you to the correct hpl, the one this is compiled "against" (with) the openMPI runtimes.
The libopen-rte.so should point to the full path of a file. If it does not, again, go to your system administrator and ask him/her for the full LD_LIBRARY_PATH that you should have to run against this hpl program.
The path should be available to you by default on all machines in the cluster. If not, add the LD_LIBRARY_PATH setting into the .bashrc file and include your .bashrc from your .bash_profile (if you're using csh, god help you; if ksh, just change the names to .kshrc and .profile). Now log into the other machine and run the ldd command as above; you should see the line pointing to the full path of the MPI rte library.
Make sure this all works by running:
You should get 8 instances of the correct LD_LIBRARY_PATH.
Now go back and try getting this to run for exactly 2 processes. (P=2, Q=1, -np 2)
Now modify the machine file so it has two lines in it, one for each hostname, and run it again.
If we're at this point, try again with 8; if it fails, there are some other things to look at and try.
Ok Otheus, i have done everything you have said, and still the same error.
This is the output from steps 1-2:
in_intel/em64t/xhpl_em64t
/opt/intel/mkl/10.0.1.014/benchmarks/mp_linpack/bin_intel/em64t/xhpl_em64t: ELF 64-bit LSB executable, AMD x86-64, version 1 (SYSV), for GNU/Linux 2.4.1, dynamically linked (uses shared libs), for GNU/Linux 2.4.1, not stripped.
As I suspected, your administrator did not give you the MPI version; rather he compiled it for the threading model. Show your administrator the output from step 3 and kindly ask him/her to recompile it for you with the OpenMPI.
I was able to succesfully run xhpl using your HPL.dat file on 6 processors across 2 nodes.
The command used was:
(Note the "-mca btl tcp,self" is to avoid warnings and errors w.r.t. Infiniband, which we don't have here. If this is your problem, it's still your admin's fault!)
The machines file was as follows:
The HPL.dat file was identical to the one you posted here, with the exception of Q = 3 (since I have one 4-cpu host and one 2-cpu host). Also HPL.out was changed to 340 for speed reasons, but prior tests indicated it worked well to at least 2500 on my hosts. Large values of N may cause the system to run out of memory, but this would be a different error.
To compile the HPL program, I used the command "make arch=TIS" (my firm is called Tiscover) and the following Makefile (Make.TIS). For your admin's sake, I have hilighted some important changes:
Last edited by otheus; 05-15-2009 at 11:51 AM..
Reason: colors
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